C0200 Front Speed Sensor RH Circuit

C0200 Front Speed Sensor RH Circuit

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Diag Code: 31

CIRCUIT EXPLANATION The speed sensors detect wheel speed and transmit the signals to the ECU. These signals are used for control of the ABS control system. Each of the front and rear rotors has 48 serrations. When the rotors rotate, the magnetic filed generated by the permanent magnet in the speed sensor induces an AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel. DTCs C1271 and C1272 can be deleted when the speed sensor sends a wheel speed signal or the Test Mode ends. DTCs C1271 and C1272 are output only in the Test Mode.

DTC Code	Diag Code	DTC Detection Condition	Trouble Area
C0200 C0205	31 32	When any of the following is detected: At a vehicle speed of 10 km/h (6 mph) or more, an open or short in the sensor signal circuit continues for 15 seconds or more. Momentary interruption of the sensor signal from the abnormal wheel occurs 7 times or more. An open in the speed sensor signal circuit continues for 0.5 seconds or more. When the following condition occurs 4 or more times after the ignition switch is turned off: The speeds of the front wheels are lower than the rear wheel speed by 20 km/h (12 mph) or more for 20 seconds or more.	• Front speed sensor RH/LH • Speed sensor circuit • Speed sensor rotor • Sensor installation • Skid control ECU
C1271 C1272	71 72	Detected only during Test Mode.	• Front speed sensor RH/LH • Sensor installation • Speed sensor rotor

• DTCs C0200 and C1271 are for the front speed sensor RH. • DTCs C0205 and C1272 are for the front speed sensor LH.

WIRING DIAGRAM INSPECTION PROCEDURE

1.PERFORM TEST MODE (SIGNAL CHECK)

Detail

1. Perform sensor check in the Test Mode procedure (See TEST MODE PROCEDURE). OK: All Test Mode DTCs are not output.

Go to step 3

[2] RECONFIRM DTC

2.RECONFIRM DTC

Detail

1. Turn the ignition switch off.
2. Clear the DTC (See Pub. No. S1-YXZE05A, page 05-108).
3. Start the engine.
4. Drive the vehicle at the speed of 20 km/h (12 mph) ormore for at least 30 seconds.
5. Check if the same DTC is recorded (See Pub. No. S1- YXZE05A, page 05-108). Result:

   Result	Proceed to
   DTCs (C0200 and/or C0205) are not output	A
   DTCs (C0200 and/or C0205) are output	B

   If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE).

　

A CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (See DIAGNOSIS SYSTEM)

B Go to step 5

3.CHECK FRONT SPEED SENSOR INSTALLATION

Detail

1. Turn the ignition switch off.
2. Check the speed sensor installation. OK: There is no clearance between the sensor and the front steering knuckle. The installation bolt is tightened properly. Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf)

　

INSTALL FRONT SPEED SENSOR CORRECTLY

[4] CHECK FRONT SPEEDSENSOR TIP

4.CHECK FRONT SPEED SENSOR TIP

Detail

1. Remove the front speed sensor (See Pub. No. S1- YXZE05A, SPEED SENSOR FRONT LH).

2. Check the speed sensor tip. OK: No scratches or foreign matter on the sensor tip. Check the speed sensor signal after cleaning or replacement (See TEST MODE PROCEDURE).

　

CLEAN OR REPLACE FRONT SPEED SENSOR

[5] INSPECT FRONT SPEED SENSOR

5.INSPECT FRONT SPEED SENSOR

Detail

1. Turn the ignition switch off.
2. Install the front speed sensor.
3. Disconnect the front speed sensor connector.
4. Measure the resistance according to the value (s) in the table below. Standard resistance: for RH

   Tester Connection	Condition	Specified Condition
   1 (FR+) - 2 (FR-)	Always	0.9 to 1.3 kΩ at 20ºC (68ºF)
   1 (FR+) - Body ground	Always	10 kΩ or higher
   2 (FR-) - Body ground	Always	10 kΩ or higher

   for LH

   Tester Connection	Condition	Specified Condition
   1 (FL+) - 2 (FL-)	Always	0.9 to 1.3 kΩ at 20ºC (68ºF)
   1 (FL+) - Body ground	Always	10 kΩ or higher
   2 (FL-) - Body ground	Always	10 kΩ or higher

   Check the speed sensor signal after replacement (See TEST MODE PROCEDURE).

REPLACE FRONT SPEED SENSOR

[6] CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

6.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

Detail

1. Disconnect the skid control ECU connector.
2. Measure the resistance according to the value (s) in thetable below. Standard resistance: for RH

   Tester Connection	Condition	Specified Condition
   S14-26 (FR+) - A3-1 (FR+)	Always	Below 1Ω
   S14-26 (FR+) - Body ground	Always	10 kΩ or higher
   S14-25 (FR-) - A3-2 (FR-)	Always	Below 1Ω
   S14-25 (FR-) - Body ground	Always	10 kΩ or higher

   for LH

   Tester Connection	Condition	Specified Condition
   S14-27 (FL+) - A2-1 (FL+)	Always	Below 1Ω
   S14-27 (FL+) - Body ground	Always	10 kΩ or higher
   S14-28 (FL-) - A2-2 (FL-)	Always	Below 1Ω
   S14-28 (FL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

[7] CHECK SPEED SENSOR AND SPEED SENSOR ROTOR SERRATIONS

7.CHECK SPEED SENSOR AND SPEED SENSOR ROTOR SERRATIONS

Detail

1. Reconnect the skid control ECU connector and the frontspeed sensor connector.
2. Connect the oscilloscope to the front speed sensorterminal of the skid control ECU.
3. Check that a waveform is output by each sensor circuitwhen the tires are rotated. OK: The same waveform is output from all the 4 wheelsand there is no noise or interference in thewaveform.
   • As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the output voltage becomes greater.
   • When noise is identified in the waveform on the oscilloscope, the erratic signals are generated due to speed sensor rotor's scratches, looseness or foreign matter attached to it.

   Check the speed sensor signal after cleaning or replacement (See TEST MODE PROCEDURE).

CLEAN OR REPLACE SPEED SENSOR OR SPEED SENSOR ROTOR

[8] RECONFIRM DTC

8.RECONFIRM DTC

Detail

1. Turn the ignition switch off.
2. Clear the DTC (See Pub. No. S1-YXZE05A, page 05-108).
3. Start the engine.
4. Drive the vehicle at the speed of 20 km/h (12 mph) ormore for at least 30 seconds.
5. Check if the same DTC is recorded (See Pub. No. S1- YXZE05A, page 05-108). Result:

   Result	Proceed to
   DTCs (C0200 and/or C0205) are not output	A
   DTCs (C0200 and/or C0205) are output	B

   If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE).

　

A CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (See DIAGNOSIS SYSTEM)

B REPLACE SKID CONTROL ECU

9.DTC Clear

Detail

1. Confirm the DTC C0200 is inactive

   • Start the engine and let it idling condition.
   • Verify the DTC C0200 is inactive.

   

2. DTC Clear

   • Clear the DTC with Hino DX
   • Confirm the same DTC is not reoccurred

   

C0200 is reoccur: Return to first process Other DTC appear: Refer to concerned Trouble shooting

Complete